Withdrawal: Effect of Sting Geometry on Axial Force Calculation for the Space Launch System

2019 ◽  
Author(s):  
Christopher Eggert ◽  
Patrick R. Shea ◽  
Nalin A. Ratnayake ◽  
Steven Krist
Keyword(s):  
Axial Force ◽  
Withdrawal Effect ◽  
Space Launch ◽  
Force Calculation

scholarly journals Effect of Sting Geometry on Axial Force Calculation for the Space Launch System

2019 ◽  
Author(s):  
Christopher A. Eggert ◽  
Patrick R. Shea ◽  
Nalin A. Ratnayake ◽  
Steven E. Krist
Keyword(s):  
Axial Force ◽  
Space Launch ◽  
Force Calculation

scholarly journals Effect of Sting Geometry on Axial Force Calculation for the Space Launch System

2019 ◽  
Author(s):  
Christopher Eggert ◽  
Patrick R. Shea ◽  
Nalin A. Ratnayake ◽  
Steven Krist
Keyword(s):  
Axial Force ◽  
Space Launch ◽  
Force Calculation

scholarly journals Spectrum Analysis and Optimization of the Axial Magnetic Gear with Halbach Permanent Magnet Arrays

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 2003
Author(s):  
Fang Hu ◽  
Yilan Zhou ◽  
Hesong Cui ◽  
Xiao Liu
Keyword(s):  
Permanent Magnet ◽  
Axial Force ◽  
Spectrum Analysis ◽  
Parametric Analysis ◽  
Air Gap ◽  
Torque Density ◽  
Output Torque ◽  
Magnetic Gear ◽  
The Difference ◽  
Force Calculation

In order to study the contribution of each harmonic to the output torque and axial torque of the axial magnetic gear with Halbach permanent magnet arrays (HAMG), torque and axial force calculation formulas of the HAMG are proposed based on the air-gap flux density distribution of the HAMG. Because of the difference of the air-gap flux densities at different radii, two simplified torque and axial force calculation formulas are proposed and compared. To improve the torque capability of the HAMG, parametric analysis of eight dimensional parameters is firstly conducted. By parametric analysis, six parameters such as the inner radius have been found to have obvious impact on the output torque and output torque density of the HAMG. The optimization using Maxwell software is then executed for maximizing the output torque density of the HAMG. The output torque density of the optimized HAMG is improved from 78.1 kNm/m3 to 93.3 kNm/m3 with an increase of 19%. Furthermore, spectrum analysis is also presented to illustrate the significant output torque improvement based on the torque calculation formulas.

Analysis of Dynamic Characteristics of Pile-Soil Coupling Effect in Consideration of Large Span Cable-Stayed Bridge

2014 ◽  
Vol 501-504 ◽  
pp. 1270-1273
Author(s):  
Wen Yuan Chen
Keyword(s):  
Axial Force ◽  
Soil Structure ◽  
Coupling Effect ◽  
Reaction Force ◽  
Bending Moment ◽  
Internal Force ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Pile Cap ◽  
Force Calculation

Using the viscouselastic artificial boundary, three conditions of long-span cable-stayed bridge are analyzed,such as pile cap consolidation, pile - structure and pile soil structure interaction. Natural frequency of bridge of pile - soil - structure coupling becomes small and cycle becomes long. The pile bottom reaction force decreased obviously, at the same time, the axial force , bending moment, axial force of cable, tower of axial force and bending moment is also reduced significantly. Cable-stayed bridge is a special flexible structure, so, static internal force calculation in the tower bottom consolidation pattern is safe, but the value is too large.

scholarly journals NUMERICAL CALCULATION AND EXPERIMENTAL STUDY OF AXIAL FORCE IN A DEEP-WELL CENTRIFUGAL PUMP

2014 ◽  
Vol 44 (1) ◽  
pp. 105-110
Author(s):  
L. ZHOU ◽  
W. D. SHI ◽  
L. BAI ◽  
W. G. LU ◽  
W. LI
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Axial Force ◽  
Experimental Results ◽  
Centrifugal Impeller ◽  
Centrifugal Pumps ◽  
Deep Well ◽  
Multi Stage ◽  
Operation Process ◽  
Force Calculation

 In the operation process of centrifugal pumps, especially in multi-stage pumps, axial force is one of the main factors which affect the pump safety and reliability. This paper presents the axial force study in a deep-well centrifugal pump (DCP) with theoretical calculation, numerical simulation and experimental measure. Three different calculation formulas were respectively introduced and used in the model pump. The calculated results were compared and analyzed with the numerical simulation values and experimental results, and the detailed numerical simulation methods and experimental configuration were explained. Finally, the more accurate formula for calculating the axial force in oblique flow centrifugal impeller was selected out. At the rated flow point, the deviation of the axial force obtained by numerical simulation and the experimental value is approximately 3.8%, and the calculated result of selected formula only less than the experimental results of 2.6%. The results provide a theoretical basis for the axial force calculation in the centrifugal impeller design process.

scholarly journals Calculation Formula Optimization and Effect of Ring Clearance on Axial Force of Multistage Pump

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Chuan Wang ◽  
Weidong Shi ◽  
Li Zhang
Keyword(s):  
Axial Force ◽  
Angular Speed ◽  
Calculation Formula ◽  
Accurate Calculation ◽  
Pump Chamber ◽  
Static Pressure Distribution ◽  
Simulation And Experiment ◽  
Computational Fluid Dynamics Cfd ◽  
Multistage Pump ◽  
Force Calculation

Since overlarge axial force can damage the pump, accurate calculation formula of axial force on pump is very significant. The traditional formula is based on the assumption that the leakage amount of the pump is zero and the angular speed of fluid in the pump chamber rotates at half the impeller rotation’s angular speed. In order to propose an accurate calculation formula, the whole flow fields of multistage pumps with three different ring clearances were calculated by using Computational Fluid Dynamics (CFD). The results indicate that the axial force on first-stage impeller is larger than that on the second. Along with the change of ring clearance, the static pressure distribution on the shroud of impeller changes at the same time, which leads to the value change of axial force. Meanwhile, angular speed of the fluid in the pump chamber is changing. Therefore, this research works out the reason why the error of traditional axial force calculation is large when the amount of leakage is relatively high. At last, an accurate calculation formula of axial force on pump is obtained through the verification of numerical simulation and experiment.

Shearing Stress Model of Damage Bolt in Tunnel

2011 ◽  
Vol 90-93 ◽  
pp. 1761-1767
Author(s):  
Xiao Hua Xi ◽  
Shuan Cheng Gu
Keyword(s):  
Shear Stress ◽  
Axial Force ◽  
Surrounding Rock ◽  
Stress Model ◽  
Calculation Formula ◽  
Shearing Stress ◽  
Pullout Load ◽  
Fully Grouted Bolt ◽  
Grouted Bolt ◽  
Force Calculation

When bolt is damaged, character of stress is different from character of shear stress integrated bolt. Firstly, Based on the displacement formula of the tunnel surrounding rock，the shear stress and axial force calculation formula of integrated bolt are educed. Subsequence, based on the BOUSSINESG formula of displacement, models on fully grouted bolt shear stress and axial force of uniform rock are educed under pullout load. Consequently, the author deduces shear stress model of bolt damage (completely void of bolt and grouting), combining modes on shear stress and axial force of integrated bolt and shear stress model of bolt under pullout load..

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